Method of producing animal food



March 1933- I c. SCHILOTTERHOSE' I 1,901,2

METHOD OF PRODUCING ANIMAL FOOD Original Filed Jan. 30, 1931 Patented Mar. 14, 1933 UNITED STATES CONRAD SCHLOTTEBHOSE, O1 WEBEBIUKDE-WULSDORF, GERMANY IETHOD OI PBOD UCING ANIMAL FOOD Original application mm January so, 1931, Serial no. 512.4%. a in Divided and this application died February 20, 1982. Serial No. 594,358.

This invention relates to the method of producing animal foods from protein substances containing water, especiall from fish having a low rcentage of at and 5 other material containing glue, the subject matter of which is divided out of my application for patent in the United States filed January 30, 1931 and numbered 512,426.

' In the existing fish and slaughterhouse refuse utilization plants, no particular difficulties exist in the treatment of material containing fat, both incontinuous and also in intermittent working. For intermittent so-called working in charges, ordinar horizontal apparatus are sufiicient with double heating jacket and built-in stirring mechanism which thoroughly works the material and thus enables a uniform drying. Rotary dryin drums provided with steam jacket may a so be employed for this purose. p However, the worln'ng of lean material that is, in which not more than 2 to 3% o oil is contained in the dry product, presents the difliculty that as soon as a certain percentage of moisture is removed, the, glue producing fibres adhere to the heating walls and im de or entirel preventfurther drying. onsequently, t e time of treating a charge is considerably prolonged and. in many instances the drying must even be interrupted in order to clean the heating surfaces. Moreover, it has been positively ascertained that the adhering portions are charred or burned, so that the quality of the resultant finished product (meat or fish 'flour) is detrimentally affected. It has been endeavoured to overcome this objection by drawing oil.- the glue liquor after ster- 40 ilization, the remaining material which has no longer any tendency to cake being then dried without trouble. This method is, however, open to the objection that ,by drawing of the glue liquor, important nutritive substances (nitrogen compounds) are lost, so that the quality of the finished product is considerably lowered. All these objections are obviated by the invention which consists in that the adhesive property of the glue, which causes (jermany November 88, 1830.

if necemary under vacuum or with the ad- I mission of air during the individual work-" ing periods.

Owing to the sudden cooling of the :sterilized material, as soon as its moisture-has sunk to a certain degree, it loses its adhesive property. The subsequent final drying tog the desired degree of moisture can easilybe efi'ected without any danger that thematerial will cake on the heatmg surfaces.

While different means may be provided. for carrying the piethodinto practice,'the g5 accompanying drawing forming part of this applicationdiscloses anj'apparatus by which p the method has been successfully practiced.

In this drawing,

Figure 1 shows the apparatus in longi- '70 tudinal section; a I

Figure 2 is a side elevation of Fig. 1; r

Figure 3 is a section on line 1-1 of Fig. 1; and 1 1 Fig. 4 is a section online IVIV of Fig.

A horizontal completely closed druI n a with heating jacket b serves for sterilizing the material, and a connection for direct steamsupply may also be provided especiso ally for-the sterilization of slaughterhouse refuse. This sterilization is carried out at a more'or less high temperature, according to the material to be treated, fish waste or slaughterhouse refuse. A stirring mechanism (I mounted on a shaft 0 is built into the drum a, and effects a thorough working of conveying mechanism and serving chiefly for cooling. The drum h also has a heating jacket in and a stirring mechanism mount-- ed on a shaft 2', said mechanism thoroughly working the material and conveying it to the discharge aperture Z. The material passes through the aperture Z into a laterally arranged elevator, the buckets a of which convey the material to a separate apparatus, for example, the drum 0. This drum 0 also has a jacket p which is arranged so that the material contained in the apparatus may be cooled by introducing cooling water into the jacket p. At the same time, air can be supplied in any suitable manner through a vent 9 adjustable by a shutter or the like.

As soon as the glue is bound in the material, this drum 0- may also be employed for drying by admitting steam into its jacket 39.

A separate stirring mechanism 8 is mounted on a shaft 1" of the drum 0 and removes the material from the elevator m. The material can also be returned to the drum h from the drum 0 through a suitable chute 73 also adapted to be closed by a shutter t In this manner, it is possible to obtain a circulation of the material Within the drum h and the drum 0, the material being alter nately heated and cooled. After the binding of the glue, the drying takes place-in both drums, the vapors produced being sucked off through discharge pipes 21, by means of an exhauster or a vacuum pump. However, at the same time the drum 0 above the lower drum h is extended so that the finished material is supplied to a discharge chute '0 which can be closed by a shutter 0 and, on the chute 1; being opened, the material can be sacked at this point, the chute t being closed by the shutter t As the emptying is effected through the drum 0, the finished material can at the same'time be cooled by supplying cooling water into the jacket p, so that it is directly ready for sacking, and a separate cooling in the air is therefore not necessary. This is very desirable in the interests of good quality and durability of the finished material.

I claim:

1. A method for producing animal foods from protein substances containing water, especially from fish having a low percentage of fat and other material containing glue, consisting in heating the material and in ation.

CONRAD SCHLOTTERHOSE.

removing the adhesive property of the glue sisting in effecting a subsequent drying in a single operation after the cooling and heat- 111g.

3. A method as specified in claim 1, con- 

